Upper main shaft



FIG. 1 is a front perspective view of an upper main shaft according tothe present application.

FIG. 2 is a front view of the upper main shaft of FIG. 1.

FIG. 3 is a rear view of the upper main shaft of FIG. 1.

FIG. 4 is a right view of the upper main shaft of FIG. 1.

FIG. 5 is a left view of the upper main shaft of FIG. 1.

FIG. 6 is a top view of the upper main shaft of FIG. 1; and,

FIG. 7 is a bottom view of the upper main shaft of FIG. 1.

CLAIM The ornamental design for an upper main shaft, as shown.